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“The notion that this was a playful snowball fight obviously is not true,” Patrick Hendry, a police union president, told reporters after the proceeding. “This was an attack on the uniform that these police officers wear so proudly every day. They came after these police officers, pelting them with ice, rocks.”

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"The Court ordered Mr. Burke to travel across the country to appear before a California grand jury without ever allowing him to see the full documents that justified the extraordinary compulsion," Dawud Burke's attorney said in the filing.

Read's agency is currently funding various pioneering approaches to robotics, some of which involve actuators made of elastomers – like rubbery plastics. Such material might be sandwiched between electrodes so that they contract or expand as voltage is applied and removed, for example. Not unlike an animal muscle.

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Nvidia’s participation in the round has been the subject of intense speculation, particularly as reports of a $100 billion investment in September gave way to reports of a smaller investment in the months that followed.